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Configuring Field-Level Encryption in import file is the correct answer. This option allows you to specify which fields are encrypted and how to decrypt them in the import file activity. This way, you can import decrypted information to a data extension from an encrypted file of subscriber data. Managing Files in File Transfer is not a valid option, as this option only allows you to move files from one location to another, not to import them. Specifying character encoding in import file is not a valid option either, as this option only allows you to ensure the correct display of characters in different languages, not to decrypt encrypted data. You can learn more about this in the Importing Data into Marketing Cloud module on Trailhead.

Send Throttling is a feature that allows marketers to control the speed and volume of email delivery over a period of time. Send Throttling can help marketers avoid overwhelming their subscribers’ inboxes or their own website servers with too many emails at once. Send Throttling can be configured by specifying the number of emails to send per hour or per day.

Journey Builder is the tool that allows marketers to create and manage customer journeys across multiple channels and touchpoints. Journey Builder can also perform A/B testing and random splits to test different versions of messages and paths. [Source: Trailhead]

The correct answer is B because bounced contacts from previous sends are excluded from future sends by default, unless they are reactivated. DoNotTrack preferences only affect tracking data, not sending. Suppressed contacts from contact deletion are not relevant because the data extension contains the audience for the send.